Multi Jumping is a flexible surface that multiple people can jump on at the same time, and sink or jump higher than usual. 

When you stand on Multi Jumping, the surface beneath your feet sinks, creating warps in space and time. This distortion attracts stardust from the universe and births new stars. If you continue to jump on a star, the star will grow. When the life of the star ends, it returns to stardust and becomes the building blocks of new stars.

A gigantic and heavy star will eventually become a black hole that swallows up all the surrounding stars and stardust.